Question

我的程序是验证输入代码是否为空。条件是如果输入的代码编号（通过csv文件）继续，如果代码编号为空，则显示错误消息。＆＃34;代码编号为空行：__＆＃34;。我的问题是如何打印代码编号为空的行的索引。

这是我的样本数据（csv）：

CRITERIA  CODE  NAME  AGE ADDRESS
ADD       0001  JOHN  21  USA
ADD             MICH  16  EUR
ADD             ALI   11  PHL

错误信息应为：

"The code number is empty in line 2."
"The code number is empty in line 3."

这是我目前的计划：

private static String[] sNextLine2; 
public static Map<String,Employee> getChanges
( String sFileName, Map<String, Employee> mEmployeeList )
throws IOException {
                                    //Read_File
    setReader2(new CSVReader(new FileReader(sFileName)));
    while ((sNextLine2 = reader2.readNext()) != null) { 
    switch(sNextLine2[0]) {
        case "ADD":         
            if(sNextLine2[1].isEmpty()) {
                System.out.println("The code number is empty in line" + lineNumber); //how to get that line number

            } else if (mEmployeeList.containsKey(sNextLine2[1]))
            {
                System.out.println("Data already exist");
            }
            else
            {
                mEmployeeList.put(sNextLine2[1],new Employee(sNextLine2[1],
                        sNextLine2[2], sNextLine2[3], sNextLine2[4], sNextLine2[5],
                        sNextLine2[6], sNextLine2[7], sNextLine2[8]));
            }

            break;
    }

我希望有人会帮助我。谢谢！

Answer 1

你可以添加一个计数器，每.readNext()递增一次，如果有错误就打印出来

 int counter=0;
 while ((sNextLine2 = reader2.readNext()) != null) { 
    counter++;
    switch(sNextLine2[0]) {
        case "ADD":         
            if(sNextLine2[1].isEmpty()) {
                System.out.println("The code number is empty in line" + counter); //how to get that line number

            } else if (mEmployeeList.containsKey(sNextLine2[1]))
            {
                System.out.println("Data already exist");
            }
            else
            {
                mEmployeeList.put(sNextLine2[1],new Employee(sNextLine2[1],
                        sNextLine2[2], sNextLine2[3], sNextLine2[4], sNextLine2[5],
                        sNextLine2[6], sNextLine2[7], sNextLine2[8]));
            }

            break;
    }

如何在java中获取csv文件的行索引

1 个答案: